JPH04250823A - Treatment of hydrogen chloride-containing waste gas - Google Patents
Treatment of hydrogen chloride-containing waste gasInfo
- Publication number
- JPH04250823A JPH04250823A JP2409483A JP40948390A JPH04250823A JP H04250823 A JPH04250823 A JP H04250823A JP 2409483 A JP2409483 A JP 2409483A JP 40948390 A JP40948390 A JP 40948390A JP H04250823 A JPH04250823 A JP H04250823A
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- hydrogen chloride
- waste gas
- slaked lime
- treatment
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 title claims abstract description 22
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 title claims abstract description 22
- 229910000041 hydrogen chloride Inorganic materials 0.000 title claims abstract description 22
- 239000002912 waste gas Substances 0.000 title abstract 4
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 20
- 239000000428 dust Substances 0.000 claims abstract description 20
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 10
- 239000000203 mixture Substances 0.000 claims abstract description 6
- 239000007789 gas Substances 0.000 claims description 35
- 239000002245 particle Substances 0.000 claims description 21
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 19
- 239000000920 calcium hydroxide Substances 0.000 claims description 19
- 235000011116 calcium hydroxide Nutrition 0.000 claims description 19
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 15
- 238000001914 filtration Methods 0.000 claims description 6
- 230000003472 neutralizing effect Effects 0.000 claims description 4
- 238000011144 upstream manufacturing Methods 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 238000007664 blowing Methods 0.000 claims description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 abstract 1
- 229910052791 calcium Inorganic materials 0.000 abstract 1
- 239000011575 calcium Substances 0.000 abstract 1
- 238000009825 accumulation Methods 0.000 description 13
- 238000006243 chemical reaction Methods 0.000 description 12
- 238000009423 ventilation Methods 0.000 description 8
- 238000011001 backwashing Methods 0.000 description 5
- 238000007796 conventional method Methods 0.000 description 4
- 230000002378 acidificating effect Effects 0.000 description 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 235000011148 calcium chloride Nutrition 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Landscapes
- Treating Waste Gases (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】この発明は、濾過集塵式排ガス処
理機を用いて塩化水素ガスその他を含む燃焼排ガスを処
理する方法に関し、さらに詳しくは、バグフィルタの逆
洗回数をできるだけ減らして塩化水素を高効率で除去す
ることができる方法に関するものである。[Industrial Application Field] The present invention relates to a method for treating combustion exhaust gas containing hydrogen chloride gas and other gases using a filtration and dust collection type exhaust gas treatment device. The present invention relates to a method that can remove hydrogen with high efficiency.
【０００２】0002
【従来の技術】一般に、塩化水素含有排ガスのような酸
性排ガスの処理方法としては、湿式、半乾式および乾式
のアルカリ法が行われている。これらの方法の基本反応
は、排ガス中に消石灰のようなアルカリ性化合物を吹き
込んでこれで塩化水素のような酸性含有物を中和するも
ので、次式の如く進行する。2. Description of the Related Art In general, wet, semi-dry and dry alkaline methods are used to treat acidic exhaust gas such as hydrogen chloride-containing exhaust gas. The basic reaction of these methods is to inject an alkaline compound such as slaked lime into the exhaust gas to neutralize acidic substances such as hydrogen chloride, and proceeds as shown in the following equation.
【０００３】
Ｃａ（ＯＨ）２＋２ＨＣｌ → ＣａＣｌ２＋２Ｈ
２Ｏ消石灰を吹き込むだけでは上記反応の反応率が低い
ので、吹き込む部の後流にバグフィルタのような濾過集
塵式排ガス処理機を設置し、図２に示すように、未反応
の消石灰を含むダストをバグフィルタ（２１）の前流面
に堆積させ、このダスト堆積層（２２）に排ガスを通過
させ、堆積層中の消石灰と排ガス中の塩化水素との反応
によって塩化水素除去率を向上させている。[0003] Ca(OH)2+2HCl → CaCl2+2H
Since the reaction rate of the above reaction is low if only 2O slaked lime is blown in, a filtration and dust collection type exhaust gas treatment device such as a bag filter is installed downstream of the blowing part, and as shown in Figure 2, the reaction rate of the above reaction is low. Dust is deposited on the front surface of the bag filter (21), and the exhaust gas is passed through this dust accumulation layer (22), and the hydrogen chloride removal rate is improved by the reaction between slaked lime in the accumulation layer and hydrogen chloride in the exhaust gas. ing.
【０００４】上記のような方法ではダスト堆積層の層厚
が増すほど、反応率が向上するが、堆積層があまり厚く
なると、通気抵抗が大きくなり、後流における排気の吸
引が不可能になるので、通常は随時バグフィルタの逆洗
を行なって堆積層の通気抵抗を一定値以上に保持してい
る。[0004] In the above method, the reaction rate improves as the thickness of the dust deposit layer increases, but if the deposit layer becomes too thick, ventilation resistance increases and it becomes impossible to suck exhaust gas in the wake. Therefore, the bag filter is normally backwashed from time to time to maintain the ventilation resistance of the deposited layer above a certain value.
【０００５】[0005]
【発明がしようとする課題】しかし、バグフィルタの逆
洗を行なっている間は必然的に排ガス処理は休止せざる
をえず、頻繁な逆洗は排ガス処理効率の低下を招いてい
る。However, while the bag filter is being backwashed, exhaust gas treatment must necessarily be suspended, and frequent backwashing causes a decrease in exhaust gas treatment efficiency.
【０００６】この発明の目的は、上記の点に鑑み、バグ
フィルタの逆洗回数をできるだけ減らして塩化水素を高
効率で除去することができる方法を提供するにある。[0006] In view of the above points, an object of the present invention is to provide a method that can remove hydrogen chloride with high efficiency by reducing the number of times a bag filter is backwashed as much as possible.
【０００７】[0007]
【課題を解決するための手段】この発明は上記目的を達
成すべく工夫されたもので、消石灰と粒径不均一な炭酸
カルシウムとの混合物を用いると、ダスト堆積層が厚く
なっても、通気抵抗がそれほど大きくならず、そのため
逆洗の回数を減らすことができるという知見を得て完成
されたものである。[Means for Solving the Problems] This invention has been devised to achieve the above object. By using a mixture of slaked lime and calcium carbonate with non-uniform particle sizes, even if the dust accumulation layer becomes thick, it is possible to This method was completed based on the knowledge that the resistance is not so large and therefore the number of backwashes can be reduced.
【０００８】すなわち、この発明による塩化水素含有排
ガスの処理方法は、濾過集塵式排ガス処理機を用いた排
ガス処理において、中和剤としての消石灰に粒径不均一
な炭酸カルシウムを混合して得られた混合物を該処理機
の前流で排ガス中に吹き込むことを特徴とするものであ
る。That is, the method for treating hydrogen chloride-containing exhaust gas according to the present invention involves mixing slaked lime as a neutralizing agent with calcium carbonate having a non-uniform particle size in exhaust gas treatment using a filtration and dust collection type exhaust gas treatment machine. The present invention is characterized in that the resulting mixture is blown into the exhaust gas upstream of the treatment machine.
【０００９】中和用の消石灰の粒径は通常５μ程度であ
る。粒径不均一な炭酸カルシウムは５μ以上の不均一な
粒径を有する粒子より成るものである。The particle size of slaked lime for neutralization is usually about 5 μm. Calcium carbonate having a non-uniform particle size is composed of particles having a non-uniform particle size of 5 microns or more.
【００１０】0010
【作用】この発明の塩化水素含有排ガスの処理方法によ
れば、濾過集塵式排ガス処理機を用いた排ガス処理にお
いて、中和剤としての消石灰に粒径不均一な炭酸カルシ
ウムを混合して得られた混合物を該処理機の前流で排ガ
ス中に吹き込むので、未反応の消石灰粒子と粒径不均一
な炭酸カルシウム粒子を含むダストを濾過集塵式排ガス
処理機のフィルタ前流面に堆積させ、このダスト堆積層
に排ガスを通過させ、堆積層中の消石灰と排ガス中の塩
化水素を反応させることによって、消石灰と排ガス中の
塩化水素の接触面積が大きく、その結果高い反応率が得
られる。したがって、ダスト堆積層が厚くなっても、通
気抵抗がそれほど大きくならず、逆洗の回数を減らすこ
とができる。[Function] According to the method for treating hydrogen chloride-containing exhaust gas of the present invention, calcium carbonate of non-uniform particle size is mixed with slaked lime as a neutralizing agent in exhaust gas treatment using a filtration and dust collection type exhaust gas treatment machine. Since the mixture is blown into the exhaust gas upstream of the treatment machine, dust containing unreacted slaked lime particles and calcium carbonate particles of non-uniform particle size is deposited on the upstream surface of the filter of the filtration and dust collection type exhaust gas treatment machine. By passing exhaust gas through this dust accumulation layer and causing the slaked lime in the accumulation layer to react with hydrogen chloride in the exhaust gas, the contact area between the slaked lime and hydrogen chloride in the exhaust gas is large, resulting in a high reaction rate. Therefore, even if the dust accumulation layer becomes thick, the ventilation resistance does not increase so much, and the number of times of backwashing can be reduced.
【００１１】[0011]
【実施例】つぎに、この発明を具体的に説明するために
、この発明の実施例を示す。EXAMPLES Next, examples of the present invention will be shown in order to specifically explain the present invention.
【００１２】粒径５μの中和用消石灰粒子（３） に不
均一な粒径８〜１２μの炭酸カルシウム粒子（４） を
混合し、得られた混合物を排ガス中に吹き込んだ。吹き
込む部の後流に設置されたバグフィルタによって、図１
に示すように、未反応の消石灰粒子（３） と不均一な
粒径８〜１２μの炭酸カルシウム粒子（４） を含むダ
ストをバグフィルタ（１） の前流面に堆積させた。こ
うして形成されたダスト堆積層（２） に排ガスを通過
させ、堆積層中の消石灰と排ガス中の塩化水素を反応さ
せた。このダスト堆積層（２） では、堆積層中の炭酸
カルシウム粒子（４） の粒径が不均一であるため消石
灰と排ガス中の塩化水素の接触面積が大きく、その結果
高い反応率が得られた。Calcium carbonate particles (4) having a non-uniform particle size of 8 to 12 μm were mixed with neutralizing slaked lime particles (3) having a particle size of 5 μm, and the resulting mixture was blown into the exhaust gas. Figure 1.
As shown in Figure 2, dust containing unreacted slaked lime particles (3) and calcium carbonate particles (4) with a nonuniform particle size of 8 to 12 microns was deposited on the front flow surface of the bag filter (1). Exhaust gas was passed through the dust accumulation layer (2) thus formed, and slaked lime in the accumulation layer reacted with hydrogen chloride in the exhaust gas. In this dust accumulation layer (2), the particle size of the calcium carbonate particles (4) in the accumulation layer is non-uniform, so the contact area between slaked lime and hydrogen chloride in the exhaust gas is large, resulting in a high reaction rate. .
【００１３】図３は、堆積層（２） の層厚（ｚ） と
通気抵抗（ΔＰ）との関係を示すもので、当量比一定で
同じ通気抵抗（ΔＰ）のとき、堆積層（２） がどの程
度増すかを見たものである。同図から、この発明の方法
では従来の方法に比べ、上記条件で堆積層（２） が増
大し、その結果消石灰と排ガス中の塩化水素の接触面積
が大きく、反応率が向上したことがわかる。FIG. 3 shows the relationship between the layer thickness (z) of the deposited layer (2) and the ventilation resistance (ΔP). When the equivalence ratio is constant and the ventilation resistance (ΔP) is the same, the deposited layer (2) This is to see how much it increases. From the same figure, it can be seen that in the method of this invention, the deposited layer (2) increased under the above conditions compared to the conventional method, and as a result, the contact area between slaked lime and hydrogen chloride in the exhaust gas was large, and the reaction rate was improved. .
【００１４】図４は、当量比とＨＣｌ除去率の関係を示
すものである。同図から、従来の方法ではＨＣｌ除去率
は当量比３以上で９５％の横這いになっていたが、この
発明の方法による反応率の向上により、２．５以上の当
量比で従来法とほぼ同等のＨＣｌ除去率９５％が得られ
ることがわかる。FIG. 4 shows the relationship between equivalence ratio and HCl removal rate. From the same figure, it can be seen that in the conventional method, the HCl removal rate remained unchanged at 95% at an equivalence ratio of 3 or more, but due to the improved reaction rate by the method of this invention, it is almost as good as the conventional method at an equivalence ratio of 2.5 or more. It can be seen that an equivalent HCl removal rate of 95% can be obtained.
【００１５】かくして実施例の方法では、ダスト堆積層
が厚くなっても、通気抵抗がそれほど大きくならず、そ
のため逆洗の回数を減らすことができる。Thus, in the method of the embodiment, even if the dust accumulation layer becomes thick, the ventilation resistance does not increase so much, and therefore the number of backwashing operations can be reduced.
【００１６】[0016]
【発明の効果】この発明の塩化水素含有排ガスの処理方
法によれば、ダスト堆積層が厚くなっても、通気抵抗が
それほど大きくならず、そのため逆洗の回数をできるだ
け減らして塩化水素を高効率で除去することができる。[Effects of the Invention] According to the method for treating exhaust gas containing hydrogen chloride of the present invention, even if the dust accumulation layer becomes thick, the ventilation resistance does not increase so much, and therefore the number of backwashing operations can be reduced as much as possible to efficiently remove hydrogen chloride. It can be removed with .
【００１７】このように反応率を向上させることによっ
て消石灰の供給量を節減することができる。By improving the reaction rate in this manner, the amount of slaked lime supplied can be reduced.
【００１８】さらに、逆洗回数の減少によってフィルタ
の耐久性を向上させることもできる。Furthermore, the durability of the filter can be improved by reducing the number of times of backwashing.
【図１】 この発明の実施例の方法を示すバグフィル
タの断面図である。FIG. 1 is a sectional view of a bag filter showing a method according to an embodiment of the present invention.
【図２】 従来方法を示すバグフィルタの断面図であ
る。FIG. 2 is a sectional view of a bag filter showing a conventional method.
【図３】 堆積層の層厚（ｚ） と通気抵抗（ΔＰ）
との関係を示すグラフである。[Figure 3] Layer thickness (z) and ventilation resistance (ΔP) of the deposited layer
It is a graph showing the relationship between
【図４】 当量比とＨＣｌ除去率の関係を示すグラフ
である。FIG. 4 is a graph showing the relationship between equivalence ratio and HCl removal rate.
１ バグフィルタ ２ ダスト堆積層 ３ 未反応の消石灰粒子 1 Bug filter 2 Dust accumulation layer 3 Unreacted slaked lime particles
Claims (1)
ス処理において、中和剤としての消石灰に粒径不均一な
炭酸カルシウムを混合して得られた混合物を該処理機の
前流で排ガス中に吹き込むことを特徴とする塩化水素含
有排ガスの処理方法。Claim 1: In exhaust gas treatment using a filtration and dust collection type exhaust gas treatment machine, a mixture obtained by mixing slaked lime as a neutralizing agent with calcium carbonate of non-uniform particle size is used upstream of the treatment machine to treat the exhaust gas. A method for treating exhaust gas containing hydrogen chloride, characterized by blowing it into the interior.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2409483A JPH0757305B2 (en) | 1990-12-28 | 1990-12-28 | Treatment method of exhaust gas containing hydrogen chloride |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2409483A JPH0757305B2 (en) | 1990-12-28 | 1990-12-28 | Treatment method of exhaust gas containing hydrogen chloride |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04250823A true JPH04250823A (en) | 1992-09-07 |
| JPH0757305B2 JPH0757305B2 (en) | 1995-06-21 |
Family
ID=18518813
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2409483A Expired - Lifetime JPH0757305B2 (en) | 1990-12-28 | 1990-12-28 | Treatment method of exhaust gas containing hydrogen chloride |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0757305B2 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6090028A (en) * | 1983-10-21 | 1985-05-21 | Mitsubishi Heavy Ind Ltd | Removing method of hydrogen chloride |
| JPH01155936A (en) * | 1987-12-11 | 1989-06-19 | Mitsui Eng & Shipbuild Co Ltd | Apparatus for removing acidic component from waste gas of dust incineration furnace |
-
1990
- 1990-12-28 JP JP2409483A patent/JPH0757305B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6090028A (en) * | 1983-10-21 | 1985-05-21 | Mitsubishi Heavy Ind Ltd | Removing method of hydrogen chloride |
| JPH01155936A (en) * | 1987-12-11 | 1989-06-19 | Mitsui Eng & Shipbuild Co Ltd | Apparatus for removing acidic component from waste gas of dust incineration furnace |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0757305B2 (en) | 1995-06-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
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Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19951205 |